Print Preview: Fix failure to save with long page title

ui/shell_dialogs/select_file_dialog.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_SHELL_DIALOGS_SELECT_FILE_DIALOG_H_
 #define UI_SHELL_DIALOGS_SELECT_FILE_DIALOG_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 117 matching lines @@
     bool include_all_files;
 
     // Specifies which type of paths the caller can handle. If it is
     // NATIVE_PATH, the dialog creates a native replica of the non-native file
     // and returns its path, so that the caller can use it without any
     // difference than when it were local.
     enum AllowedPaths { ANY_PATH, NATIVE_PATH, NATIVE_OR_DRIVE_PATH };
     AllowedPaths allowed_paths;
   };
 
+  // Returns a file path with a base name at most 255 characters long. This
+  // is the limit on Windows and Linux, and on Windows the system file
+  // selection dialog will fail to open if the file name exceeds 255 characters.
+  static base::FilePath GetShortenedFilePath(const base::FilePath& path);
+
   // Selects a File.
   // Before doing anything this function checks if FileBrowsing is forbidden
   // by Policy. If so, it tries to show an InfoBar and behaves as though no File
   // was selected (the user clicked `Cancel` immediately).
   // Otherwise it will start displaying the dialog box. This will also
   // block the calling window until the dialog box is complete. The listener
   // associated with this object will be notified when the selection is
   // complete.
   // |type| is the type of file dialog to be shown, see Type enumeration above.
   // |title| is the title to be displayed in the dialog. If this string is
@@ skipping 62 matching lines @@
   std::unique_ptr<SelectFilePolicy> select_file_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(SelectFileDialog);
 };
 
 SelectFileDialog* CreateSelectFileDialog(SelectFileDialog::Listener* listener,
                                          SelectFilePolicy* policy);
 }  // namespace ui
 
 #endif  // UI_SHELL_DIALOGS_SELECT_FILE_DIALOG_H_